Second order effects in RC columns: comparative analysis of design approaches
Visualitza/Obre
Estadístiques de LA Referencia / Recolecta
Inclou dades d'ús des de 2022
Cita com:
hdl:2099.1/14626
Tutor / directorTaerwe, Luc
Tipus de documentProjecte/Treball Final de Carrera
Data2010
Condicions d'accésAccés obert
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Abstract
The objective of this project is to analyze different design approaches for RC
columns, in particular those cases in which second order effects should be
considered when the column is under compression.
Throughout the study, a variety of support cases and different types of section
will be presented for columns of different slenderness ratios. These cases will
be resolved using the Simplified Methods provided in Eurocode 2 and the
evolution of second order effects with the slenderness ratio will be studied.
Within this study, the influence of creep, area of reinforcement and area of
concrete in the second order moment will be investigated, to then discern the
differences between the Nominal Stiffness and the Nominal Curvature methods.
It will be determined that in the Nominal Stiffness method creep has an
increasing effect as the slenderness ratio increments. Creep will have an effect
in the Nominal Curvature method until a certain slenderness value is achieved,
which depends on the compressive characteristic strength.
When studying the influence of the areas of reinforcement and concrete in
taking into account second order effects, it will also be deduced that increasing
the area of reinforcement is a good solution if the slenderness only just exceeds
the slenderness limit. If the slenderness is much higher than the limit, then it is
better to increase the area of concrete since it will increase the limit and reduce
the slenderness more effectively.
The differences found between the three types of sections will also be a subject
of study. These sections will be rectangular with reinforcement placed in
opposite sides, rectangular with uniform distribution of reinforcement and
circular with uniform distribution of reinforcement. The first section is the least
affected by second order effects whilst the second section is the most affected.
For the calculations, a tool in the form of a spreadsheet for the Simplified
Methods will be created with the purpose of being intuitive to use and generate
output values automatically.
Finally, columns of different slenderness ratios will be modeled and tested by
means of a finite element (FEM) analysis. The results of the evolution of the
second order moment with the slenderness ratio will be compared to those
obtained through the Simplified Methods and will prove to be quite similar.
MatèriesColumns, Concrete -- Design and construction, Columns, Concrete -- Mathematical models, Columnes de formigó -- Disseny i construcció, Columnes de formigó -- Models matemàtics
ProvinençaAquest document conté originàriament altre material i/o programari no inclòs en aquest lloc web
TitulacióENGINYERIA INDUSTRIAL (Pla 1994)
Fitxers | Descripció | Mida | Format | Visualitza |
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5_Master Thesis_Paul Frost (pdf).pdf | Report | 3,367Mb | Visualitza/Obre |